I have recently become fascinated with new ideas of transportation. The magnetic train is capable of going really fast. To make it even faster you can put the magnetic train in a vacuum tunnel so that there is no air resistance while it is in motion. I have an idea similar to this one but instead of putting the whole train in a vacuum tunnel, if you have the part of the tunnel where the train is heading be a vacuum there would still be no air resistance but behind the train there could be positive pressure that would push the train. The train itself would act as an air tight seal splitting the tunnel into vacuum and pressurized sections. The idea is similar to a blow dart. One problem with this idea though is that you would need a very large air pump if you plan on filling the tunnel with air as fast as the train is moving. Another problem I see would be reducing the amount of friction that the train would have as it is acting as an air seal. I'm not sure if this idea would work but I thought it was just something ineresting to talk about. If anyone has suggestions or ideas on how you couold improve it I would be interested.

I have recently become fascinated with new ideas of transportation. The magnetic train is capable of going really fast. To make it even faster you can put the magnetic train in a vacuum tunnel so that there is no air resistance while it is in motion. I have an idea similar to this one but instead of putting the whole train in a vacuum tunnel, if you have the part of the tunnel where the train is heading be a vacuum there would still be no air resistance but behind the train there could be positive pressure that would push the train. The train itself would act as an air tight seal splitting the tunnel into vacuum and pressurized sections.

The first subways in NYC were pneumatic and worked much the way you describe. (Not a vacuum of course.) The problem with that on a large scale is how much energy the system would use, and how only one train can use the system at a time. Compressing and evacuating air takes a lot of energy and time.